<!DOCTYPE html>
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<html>
    <head>
        <meta charset="UTF-8">
        <title>打印金字塔</title>
    </head>
    <body>
    
        <?php
         $hang=13;
         for($i=1;$i<=$hang;$i++)
         {  
             for($k=1;$k<=$hang-$i;$k++)
             {
                 echo "&nbsp;";
             }
             
             for($j=1;$j<=$i*2-1;$j++)
             {
                 echo "";
             }
             echo "<br/>";
         }
        ?>
    
    </body>
</html>
